Initialize project with DIUN Webhook Dashboard: core Go app, Docker setup, static assets, and documentation.

Dockerfile

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+FROM golang:1.26-alpine AS builder
+WORKDIR /app
+COPY . .
+RUN go build -o app
+
+FROM alpine:latest
+WORKDIR /app
+COPY --from=builder /app/app .
+COPY static ./static
+EXPOSE 8080
+CMD ["./app"]